Chinese pea tree vs pea tree

Chinese pea tree and pea tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chinese pea tree	Yes	No	No	No
pea tree	Yes	No	No	No

As nouns, pea tree is a hypernym of Chinese pea tree; that is, pea tree is a word with a broader meaning than Chinese pea tree:

Chinese pea tree: shrub with dark-green glossy foliage and solitary pale yellow flowers; northern China
pea tree: any plant of the genus Caragana having even-pinnate leaves and mostly yellow flowers followed by seeds in a linear pod

Other hypernyms of Chinese pea tree include caragana.

Chinese pea tree (noun)	pea tree (noun)
shrub with dark-green glossy foliage and solitary pale yellow flowers; northern China	any plant of the genus Caragana having even-pinnate leaves and mostly yellow flowers followed by seeds in a linear pod